globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-13-00155.1
Scopus记录号: 2-s2.0-84893201980
论文题名:
A 3D canopy radiative transfer model for global climate modeling: Description, validation, and application
作者: Yuan H.; Dickinson R.E.; Dai Y.; Shaikh M.J.; Zhou L.; Shangguan W.; Ji D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期:3
起始页码: 1168
结束页码: 1192
语种: 英语
Scopus关键词: Canopy absorption ; Canopy radiative transfer ; Community land models ; Global climate model ; Optical path lengths ; Plant functional type ; Solar radiative transfer ; Structural effect ; Forestry ; Radiative transfer ; Three dimensional computer graphics ; Three dimensional ; canopy ; climate change ; climate modeling ; computer simulation ; global change ; model validation ; optical property ; radiative transfer ; three-dimensional modeling
英文摘要: The process of solar radiative transfer at the land surface is important to energy, water, and carbon balance, especially for vegetated areas. Currently the most commonly used two-stream model considers the plant functional types (PFTs) within a grid to be independent of each other and their leaves to be horizontally homogeneous. This assumption is unrealistic in most cases. To consider canopy three-dimensional (3D) structural effects, a new framework of 3D canopy radiative transfer model was developed and validated by numerical simulations and shows a good agreement. A comparison with the two-stream model in the offline Community Land Model (CLM4.0) shows that an increase of canopy absorption mainly happens with sparse vegetation or withmultilayer canopies with a large sun zenith angle θsun and is due to increases of the ground and sky shadows and of the optical pathlength because of the shadow overlapping between bushes and canopy layers.Adecrease of canopy absorption occurs in densely vegetated areas with small θsun. For a one-layer canopy, these decreases are due to crown shape effects that enhance the transmission through the canopy edge. For amultilayer canopy, aside fromthese shape effects, transmission is also increased by the decreased ground shadow due to the shadow overlapping between layers. Ground absorption usually changes with opposite sign as that of the canopy absorption. Somewhat lower albedos are found overmost vegetated areas throughout the year. The 3Dmodel also affects the calculation of the fraction of sunlit leaves and their corresponding absorption. © 2014 American Meteorological Society.
资助项目: DOE, U.S. Department of Energy
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50975
Appears in Collections:气候变化事实与影响

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作者单位: School of Geography, Beijing Normal University, Beijing, China; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States; College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States

Recommended Citation:
Yuan H.,Dickinson R.E.,Dai Y.,et al. A 3D canopy radiative transfer model for global climate modeling: Description, validation, and application[J]. Journal of Climate,2014-01-01,27(3)
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